Back in November 2010, 13-year old Yara Gambirasio would leave her home in the evening only to never be seen again. Then, 3 months after her disappearance, her body would be found with superficial cuts and a large wound on her head. Most importantly however, authorities would find traces of DNA on Yara's clothing, thus beginning one of the most extensive investigations ever documented for her murderer, labelled "Unknown 1", and uncovering a slew of secrets hidden along the way.

Tune in to find out more.

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